contents (english) page no · 1 introduction thank you for purchasing a martin audio em series...

Martin Audio – EM SERIES

CONTENTS (ENGLISH) Page No1 INTRODUCTION 2

2 UNPACKING 2

3 EM15 IMPEDANCE 3

4 SAFETY FIRST 4

4.1 Rigging and suspension 4

5 AMPLIFICATION 4

6 CONNECTING TO AN AMPLIFIER 5

7 SYSTEM CONFIGURATIONS 5

8 WARRANTY 7

9 TECHNICAL SPECIFICATIONS 8

MARTIN AUDIOL O N D O N

The Martin Experience

All material © 2007. Martin Audio Ltd. Subject to change without notice.

1 INTRODUCTION

Thank you for purchasing a Martin Audio EM Series loudspeaker system.The EM15 is a miniature trapezoid full-range loudspeaker featuring twin5"(125mm) drivers in a unique two-way configuration utilising patentedICT™ (Inductively Coupled Transducer) technology. The EM150 is a twin10"(250mm) driver sub-bass system designed to be used to extend the lowfrequency performance of the EM15. It can also be used with larger EMSeries enclosures such as the EM26.

Ideally suited to background and foreground music reproduction, the EM15and EM150 are compact and easily installed. An external crossover is notnecessary, but an EMX1A controller will increase the versatility of thecomplete system, adding relative level control and driver protection.

2 UNPACKING

Each Martin Audio loudspeaker is built to the highest standard andthoroughly inspected before it leaves the factory. After unpacking thesystem, examine it carefully for any signs of transit damage and inform your dealer if any such damage is found. It is suggested that you retain the original packaging so that the system can be repacked at a future dateif necessary.

Please note that Martin Audio and its distributors cannot be heldresponsible for damage to any returned product through the use of non-approved packaging.


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This equipment conforms to the requirements of theEMC Directive 89/336/EEC, amended by 92/31/EECand 93/68/EEC and the requirements of the LowVoltage Directive 73/23/EEC, amended by 93/68/EEC.

Standards Applied EMC Emission EN55103-1:1996 Immunity EN55103-2:1996

Electrical Safety EN60065:1993


3 EM15 IMPEDANCE

The EM15 can be configured as either a 4 ohm or 16 ohm loudspeaker.The 16 ohm configuration allows up to 4 x EM15’s to be run in parallel froma single amplifier channel. The EM15 is normally supplied from the factoryin the 4 ohm configuration. To convert it to 16 ohms, follow the procedurebelow.

Fig 1FRONT BACK

1. Remove terminal panel from rear of cabinet (4 pozi screws)2. Remove red and black wires from the twin terminal, connect to each end

of the insulated terminal block.3. Replace terminal panel.


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3

INPUT

Terminal panel

Twin Terminal

Insulated terminalblock

4 ohm

16 ohm

RED

BROWN

BLACK

BLUE

RED

BROWN BLUE

BLACK


4 SAFETY FIRST

It is important that loudspeaker systems are used in a safe manner. Please take some time to review the following points concerning safe useof EM Series loudspeakers.

Professional loudspeakers are capable of producing extremely high soundlevels and should be used with care. Hearing loss is cumulative and canresult from levels above 90dB if people are exposed for a long period.Never stand close to loudspeakers driven at high level.

4.1 Rigging and suspensionWARNING: Suspending the system should only be done by qualifiedpersonnel following safe rigging practices. Secure fixings to thebuilding structure are vital. Seek help from architects, structuralengineers or other specialists if in any doubt.

5 AMPLIFICATION

The EM15 and EM150 are designed to be used with professional poweramplifiers capable of producing the following power outputs into 4 ohms:

EM15 4 ohm 50-100WEM15 16 ohm 200-400WEM150 400-500W

Care should be taken to avoid amplifier clipping. It is important tounderstand that a low power amplifier driven into clipping is more likely todamage a loudspeaker than a higher power amplifier used within its ratings.This is because music signals have a high peak-to-average "crest" factor.When an amplifier is severely overdriven, its output waveform is clipped (its peaks are squared off) – reducing the crest factor. In extreme cases,the waveform can approach that of a square wave. An amplifier is normallycapable of producing far more power under these conditions than itsundistorted rated power output.The use of very high power amplifiers with outputs greater than thoserecommended is discouraged.

Care should be taken to avoid switch-on surges, which can result inmomentary power peaks in excess of specified ratings. When powering upa sound system it is important to switch on the amplifiers after the mixerand control electronics have stabilised. When powering down the system,reverse the sequence and switch off the amplifiers first.


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4All material © 2007. Martin Audio Ltd. Subject to change without notice.

6 CONNECTING TO AN AMPLIFIER

Connections are made via stripped wires to avoid the need for solderedconnectors. The EM15 is provided with two spring-loaded terminals on therear of the enclosure and the EM150 is provided with two pairs of 4mmscrew terminals – a pair for each 10"(250mm) driver.

For mono EM150 operation these should be connected together externallyin parallel: left Red (+) to right Red (+), left Black (-) to right Black (-). Theparalleled mono impedance is 4 ohms. For stereo operation, separateconnections should be made to the EM150’s left and right terminals. Theimpedance in this case is 8 ohms left and 8 ohms right.

Note: It is important to maintain consistent polarity throughout i.e. Red toRed, Black to Black.

7 SYSTEM CONFIGURATIONS

The basic system configuration for one EM150 and up to six EM15’s isshown in Fig 2. Up to three EM15’s (each in 16 ohm configuration) arewired in parallel with the respective left and right inputs of the EM150, anddriven from the left and right channels of the power amplifier. Thisarrangement presents a 3 ohm load to each amplifier channel. Alternatively,one EM150 may be used with a pair of EM26’s, presenting a 4 ohm load tothe amplifier.

Fig 2


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5

FROM PRE-AMPAMP

LEFT CHANNEL RIGHT CHANNEL

16 ohm 16 ohm 16 ohm 16 ohm 16 ohm 16 ohm8 ohm 8 ohm


To allow for the addition of further EM15’s and balance control between theEM15’s and the EM150, a further power amplifier may be added to thesystem as shown in Fig 3. The same signal is fed into both amplifiers, onedriving the EM15’s, the other driving the EM150.

Fig 3

An EMX1A controller may be used to further increase the flexibility of thesystem (see Fig 4). With an EMX1A controller the relative levels can bebalanced in the controller. The EMX1A also provides signal limiting fordriver protection and has a 120Hz electronic crossover, removing signalsbelow this point from the EM15’s.

Fig 4


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RIGHT CHANNELLEFT CHANNEL


FROM PRE-AMP FROM PRE-AMP

AMPAMP


RIGHT CHANNELLEFT CHANNEL

INPUTS

AMPAMP

EMX1


For larger systems, the EM150 drivers can be wired externally to give a 4ohm mono sub. Two EM150’s can now be used with an increased number ofEM15’s (see Fig 5).

Fig 5

Note: Care must be taken, when connecting EM15’s in parallel, to ensure thatthe total load impedance presented to the power amplifier will not exceed theminimum specified by the amplifier manufacturer.

8 WARRANTY

Martin Audio EM Series products are warranted against manufacturing defectsin materials or craftsmanship over a period of 5 years from the date of originalpurchase. During the warranty period Martin Audio will, at it's discretion, eitherrepair or replace products which prove to be defective provided that theproduct is returned in its original packaging, shipping prepaid, to anauthorised Martin Audio service agent or distributor.

Martin Audio Ltd. cannot be held responsible for defects caused byunauthorised modifications, improper use, negligence, exposure to inclementweather conditions, act of God or accident, or any use of this product that isnot in accordance with the instructions provided by Martin Audio.Martin Audio is not liable for consequential damages.

This warranty is exclusive and no other warranty is expressed or implied. This warranty does not affect your statutory rights.


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7

INPUTS

AMP AMP

16 ohm 16 ohm 16 ohm




4 ohm 4 ohmRIGHT CHANNELLEFT CHANNEL

EMX1


9 TECHNICAL SPECIFICATIONS

EM15

TYPE Ultra compact, two-way ICT™FREQUENCY RESPONSE 120Hz-20kHz ±3dBRATED POWER 75W AES, 300W peakSENSITIVITY 91dB MAXIMUM SPL 108dB continuous, 114dB peakRECOMMENDED AMPLIFIER 50-100W (into 4 ohms)DISPERSION 80 degs horizontal x 80 degs verticalNOMINAL IMPEDANCE 4 ohms (16 ohms optional/userconfigurable)BASS 5” (125mm) HIGH FREQUENCY 5” (125mm) ICT™ENCLOSURE 5 litres, rear ventedCONNECTOR Spring-loadedFITTINGS M4 inserts for Omnimount 50DIMENSIONS (W) 172mm x (H) 282mm x (D) 172mm

(W) 6.8ins x (H) 11ins x (D) 6.8insWEIGHT 5kg (11lbs)SHIPPING DIMENSIONS (W) 390mm x (H) 370mm x (D) 200mm(Packed in pairs) (W) 15.4ins x (H) 14.5ins x (D) 7.9insSHIPPING WEIGHT 9kg (19.8lbs)(Packed in pairs)


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EM150

TYPE Ultra compact sub-bass systemFREQUENCY RESPONSE 45Hz-200Hz ± 3dbRATED POWER 400W AES, 1600W peak

(2 x 200W AES, 800W peak per driver)SENSITIVITY 98dB MAXIMUM SPL 123dB continuous, 129dB peakRECOMMENDED AMPLIFIER 400-500W (into 4 ohms)NOMINAL IMPEDANCE 2 x 8 ohms nominal stereo,

4 ohms nominal monoBASS 2 x 250mm (10") extended throwENCLOSURE 91 litres, ventedCONNECTOR 2 x spring-loadedDIMENSIONS (W) 790mm x (H) 360mm x (D) 410mm

(W) 31.1ins x (H) 14.2ins x (D) 16.1insWEIGHT 31kg (68lbs)SHIPPING DIMENSIONS (W) 950mm x (H) 390mm x (D) 450mm

(W) 37.4ins x (H) 15.4ins x (D) 17.7insSHIPPING WEIGHT 34kg (75lbs)

NOTES (EM Series)Sensitivity measured in half-space conditions at 1 metre with 1 watt input,using band limited pink noise. SPL measured at 1 metre using band limitedpink noise.Finish: Textured grey green paint.Protective grilles: Perforated steel grey with 48% free air flow.

Due to our policy of continuous improvement all specifications are subjectto change without notice.


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EM Series EM15/EM150

Century Point, Halifax Road, Cressex Business Park, High Wycombe, Buckinghamshire HP12 3SL, England. Telephone: +44 (0)1494 535312 Facsimile: +44 (0)1494 438669

Web: www.martin-audio.com E-mail: [email protected]



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EM Series EM15/EM150

User’s Guide


contents (english) page no · 1 introduction thank you for purchasing a martin audio em series...

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